Product details

summary

The XGN15-12 type modular AC metal enclosed ring network switchgear (hereinafter referred to as the ring network cabinet) is a new high-voltage electrical product that we have successfully designed and developed by introducing foreign technology and in accordance with the requirements of domestic agricultural and urban power grid transformation. All technical performance indicators comply with IEC62271-200:2003 and GB3906 standards.

The main switch, operating mechanism, and components of the ring main unit adopt original parts or domestically assembled SFL-12/24 switchgear, and can also be equipped with original HAD/US SF6 according to user needs. Circuit breaker or VD4-S vacuum circuit breaker. Its operation mode is divided into two types: dynamic and electric.

The cabinet is processed by CNC machine and riveted, with a protection level of IP3 ×, and has reliable mechanical interlocking and anti misoperation functions. This product has the characteristics of small size, light weight, beautiful appearance, easy operation, long life, high parameters, no pollution, and minimal maintenance.

XGN15-12 type modular AC metal enclosed ring network switchgear is suitable for receiving and distributing electrical energy in 50Hz, 12kV power networks. The main switch inside the cabinet is SF6 switch

Model meaning, technical parameters

institution

This switch has many advantages:

The arc duration is short, and the insulation strength in the arc extinguishing chamber recovers quickly.

Ensure safety and reliability even in harsh environments.

◇ Can disconnect low value inductive and capacitive currents.

The operating mechanism is simple, capable of quick opening and closing, and has a long mechanical lifespan.

◇ Reduced the wear and tear of contacts and arcing chambers, thus extending the electrical lifespan.

◇ Allow for multiple operations, but with minimal maintenance workload.

Lightweight structure, compact, and stable.

Optional equipment - S5 solid overcurrent relay

-PR511-PR512 Overcurrent Relay - Low Voltage Release

-Interlocking strong circle

HAD120625

HAD120520

HAD170620

HAD170616

Standard equipment

--Electric operation

--Manual operation

--Auxiliary contacts (2 normally open and 2 normally closed)

--Partial excitation trip with position contact

--Excitation closing coil

--Gas pressure control of signal contacts

Functional Features

Functional Features

Function and characteristic

Cabinet structure

The ring network cabinet is made of 2mm thick aluminum zinc coated plate (or cold-rolled plate after spray coating) and riveted. There are two pressure release holes at the back of the cabinet, one for the cable room and the other for the load switch/busbar room. This structure can provide limited protection for personal safety

Reliable installation and operation of equipment.

◆ Each interval chamber

◇ Busbar room

The busbar room is located at the top of the cabinet and connected to adjacent switchgear.

The load switch is an independent unit filled with SF6 gas inside.

◇ Cable room

Approximately 75% of the space is used for cable connections, fuses, grounding switches, and CT and PT installations. ◇ Institutional chamber and interlocking

The small chamber includes operating mechanisms and mechanism interlocks, as well as position indicators, auxiliary contacts, trip coils, live displays, and interlocks.

◇ Relay box

The relay box is located at the top of the cabinet and is optional. The small room is used for installing devices such as instruments, relays, and motor units.

◇ Circuit breaker room

A circuit breaker (SF6 or vacuum) can be placed below the load switch. pressure relief

◇ Pressure release above

The above is used to release the gas pressure generated during internal arc accidents in the busbar and load switch room.

◇ Pressure release below

The following is used to release the gas pressure generated during an arc accident inside the cable compartment. SFL type load switch (ABB original parts)

The SFL type load switch is a double break, rotating type dynamic contact that uses SF6 gas as the arc extinguishing medium. The dynamic and static contacts are placed in a reinforced structure molded epoxy resin shell. At the output end of the operating shaft is a transparent thermoformed plastic end cap, through which the state can be observed.

After each switch is filled with SF6 gas at a pressure of 1.4 bar, it is permanently sealed (SFL means "sealed"), and a helium detector can be used to check for gas leakage. The vertical or horizontal installation of switches is not limited. In a modular cabinet, a typical installation method is to place a steel partition between the cable room and the busbar room and install it horizontally. This installation method seals the switch housing inside a grounded steel plate and isolates the busbar from the cable joint to meet strict safety requirements for operation and maintenance.

If an internal arc occurs and there is a weak point in the structure at the rear of the casing, it will be flushed open to release the arc gas outside the switch. Subsequently, the arc discharge valve on the cabinet will be flushed open and the overpressure gas will be directed outside the cabinet.

If an internal arc occurs and there is a weak point in the structure at the rear of the casing, it will be flushed open to release the arc gas outside the switch. Subsequently, the arc discharge valve on the cabinet will be flushed open and the overpressure gas will be directed outside the cabinet.

VD4-S vacuum circuit breaker

The VD4-S vacuum circuit breaker is designed specifically for unit switchgear, and its breaking capacity is sufficient to handle various states, including normal operation of switching equipment or branch networks, as well as breaking short circuits in situations. Vacuum circuit breakers are particularly suitable for networks that operate frequently within the operating current range. The VD4-S vacuum circuit breaker is equipped with a spring operated mechanism with a reclosing function (opening -0.3s-closing -180s-closing), and its action is reliable with a long service life. The entire circuit breaker consists of three vacuum switch bubbles, with a resin insulated cylinder on the outside and a vertical structure. The extinguishing of the arc is the result of the forced displacement of the arc caused by the spiral groove of the extinguishing contact. Due to the low static vacuum level of 10-4 to 10-8 bar inside the switch insulation cylinder, high insulation strength can be achieved even though there is relatively little gap between the switch contacts. The arc extinguishes at the zero point of the short-circuit current.

Due to the small gap between the contacts and the high conductivity of the metal gas plasma region at the arc pressure drop, coupled with the short arc ignition time, the arc energy is low, which is beneficial for extending the life of the contacts and even the entire switch.

The HAD/US SF6 circuit breaker is designed specifically for ring main switchgear, with a breaking capacity sufficient to handle various states, including normal switching of equipment or branch networks, as well as breaking short circuits in situations. With SF6 breaking technology and a simple structure that requires very little operating energy, such a simple energy storage operating mechanism has the characteristic of long mechanical life during use. The use of a spring operated mechanism for circuit breakers can achieve automatic reclosing operation. The structure of the switch breaking part can provide an extraordinary guarantee for extending the electrical life. The switch is made into a separate independent column structure and placed vertically. The switch adopts the principle of self energy blowing arc, which uses the energy of the arc itself to extinguish the arc.

When the circuit breaker is opened, an arc is generated between the moving and stationary contacts in the arc extinguishing chamber. The high temperature and ionization efficiency generated by the arc should cause the SF6 gas pressure to rise rapidly in the arc extinguishing chamber. With the increase of pressure and the gradual separation of the arcing contacts, the gas is forcibly sprayed out of the arc extinguishing chamber through the nozzle, making the arc sparse, cooled, interrupted, and preventing reignition. Therefore, the switch moving part only requires a small amount of energy, which further enhances the reliability of long-term operation.

◆ K-type and A-type operating structures

This organization is used to operate load switches and load switches with fuses

◇ K-type mechanism: K-type mechanism is a single spring mechanism used for load switch on/off operation, and the switch on/off is achieved through spring energy storage through dead points. K-type mechanisms can choose motors to achieve electric operation.

Type A mechanism: A type mechanism with dual spring mechanism, one of which is used for switch closing and the other for switch opening. Before closing the switch with the closing spring, it should be placed in the energy storage state. After the closing operation, the opening will automatically be placed in the energy storage state. So it can be tripped manually, with shunt trip coils or fuse firing pins.